File:North American Plesiosaurs Elasmosaurus, Cimoliasaurus, and Polycotylus3.png
![File:North American Plesiosaurs Elasmosaurus, Cimoliasaurus, and Polycotylus3.png](https://upload.wikimedia.org/wikipedia/commons/thumb/3/3b/North_American_Plesiosaurs_Elasmosaurus%2C_Cimoliasaurus%2C_and_Polycotylus3.png/345px-North_American_Plesiosaurs_Elasmosaurus%2C_Cimoliasaurus%2C_and_Polycotylus3.png?20140818191558)
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